Split optical lens

Abstract

The application discloses a split optical lens, which comprises a substrate, a first lens, a second lens and a fiber socket, the substrate is used for being fixedly arranged on a PCB, the first lens is fixedly arranged on the top of the substrate, and the first lens is used for collimating a light beam or focusing a light beam; the second lens is detachably connected to the top of the first lens, and the second lens is used for reflecting a light beam and focusing or collimating the light beam; the fiber socket is arranged on the second lens, and the fiber socket is used for receiving the light beam and emitting light, and the application has the advantages of convenient replacement of the fiber socket, no need of re-adjusting an optical path, no need of replacing an optical engine and greatly reduced maintenance cost.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to a split optical lens. Background Technology

[0002] Generally, known optical module lenses use an optical lens and a fiber optic socket for matching. However, existing optical module lenses are usually integral structures. Due to the small tolerance of the connection between the fiber optic socket and the optical lens, they need to be pre-fixed during application, which is not suitable for applications that require pluggability. Furthermore, in NPO (Near-Package Optics) applications, when fiber damage causes the optical engine to malfunction, the entire optical module lens needs to be disassembled. During reassembly, the optical path needs to be readjusted and the optical engine needs to be replaced, resulting in high maintenance costs. Utility Model Content

[0003] The main objective of this application is to provide a split optical lens, which aims to solve the technical problem of high maintenance costs when replacing fiber optic sockets in existing integrated optical module lenses.

[0004] To achieve the above objectives, this application provides a split optical lens, including a substrate, a first lens, a second lens, and an optical fiber socket. The substrate is fixedly mounted on a PCB board; the first lens is fixedly mounted on the top of the substrate and is used to collimate or focus a beam; the second lens is detachably connected to the top of the first lens and is used to reflect, focus, or collimate a beam; the optical fiber socket is mounted on the second lens and is used to receive and emit light.

[0005] Optionally, the bottom of the second lens is provided with at least two positioning posts, and the top of the first lens is provided with a first positioning hole that cooperates with the corresponding positioning posts.

[0006] Optionally, it also includes a fastener for securing the first lens and the second lens together.

[0007] Optionally, the fastener includes a connecting plate, a first elastic plate, and two second elastic plates. The connecting plate is attached to the top surface of the second lens. The first elastic plate is connected to one side of the connecting plate and is simultaneously attached to the side end face of the first and second lenses away from the fiber optic socket, and the first elastic plate is engaged with the side end face of the first lens. The two second elastic plates are respectively connected to the front and rear ends of the connecting plate and are simultaneously attached to the front and rear end faces of the first and second lenses, and the two second elastic plates are engaged with the front and rear end faces of the first lens.

[0008] Optionally, the fastener also includes a bending portion, through which the first elastic plate and the connecting plate, and the second elastic plate and the connecting plate are connected.

[0009] Optionally, a locking block is provided on the side end face of the first lens, a locking groove is provided on the first elastic plate to cooperate with the locking block, locking posts are provided on both the front and rear ends of the first lens, and locking holes are provided on the second elastic plate to cooperate with the locking posts.

[0010] Optionally, the second lens has a slot that mates with the fiber optic socket, and a number of positioning pins are provided inside the slot. The fiber optic socket has a second positioning hole that mates with the positioning pins on one side. The fiber optic socket is connected to the slot of the second lens by an adhesive.

[0011] Optionally, a laser and a photodetector are provided on the PCB board. The laser is used to emit a light beam. A first optical lens array is provided at the bottom of the first lens, located directly above the laser and the photodetector. The first optical lens array is used to collimate or focus the light beam. A reflective surface is provided on the second lens to reflect the light beam. A second optical lens array is provided at one end of the second lens connected to the optical fiber socket. The second optical lens array is used to focus or collimate the light beam reflected by the reflective surface or the light beam emitted from the optical fiber socket.

[0012] Optionally, both the first lens and the second lens have anti-reflective slopes on their mating surfaces, the two anti-reflective slopes are arranged symmetrically, and the light path formed by the beam in the first lens and the second lens passes through the anti-reflective slopes.

[0013] Optionally, the slope of the anti-reflective ramp is greater than 6°.

[0014] The beneficial effects that this application can achieve are as follows: This application includes a substrate, a first lens, a second lens, and an optical fiber socket. The substrate is fixedly mounted on a PCB board. The first lens is fixedly mounted on the top of the substrate and is used to collimate or focus the light beam. The second lens is detachably connected to the top of the first lens and is used to reflect the light beam and focus the emitted light beam or collimate the light emitted from the optical fiber socket. The optical fiber socket is mounted on the second lens and is used to receive and emit the light beam. Based on the structure of this application, when the optical fiber socket needs to be replaced, the second lens can be removed from the first lens, thereby removing the entire optical fiber socket. When the new optical fiber socket and the second lens are reassembled and mounted on the first lens, since the first lens is fixed to the PCB board via the substrate, the installation error of the second lens is low. Therefore, there is no need to readjust the optical path or replace the optical engine, significantly reducing maintenance costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of a split optical lens in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a split optical lens mounting fixture according to an embodiment of this application; Figure 3 This is a schematic diagram of the separate structure of the first lens, the second lens, and the fiber optic socket in an embodiment of this application.

[0017] Figure label: 110-Substrate, 120-PCB board, 130-First lens, 131-First positioning hole, 132-Card block, 133-Card post, 134-First optical lens array, 140-Second lens, 141-Positioning post, 142-Slot, 143-Positioning pin, 144-Reflective surface, 145-Second optical lens array, 150-Fiber optic socket, 151-Fiber optic array, 152-Second positioning hole, 160-Fixed component, 161-Connecting plate, 162-First elastic plate, 163-Second elastic plate, 164-Bending part, 170-Laser, 180-Photodetector, 190-Anti-reflective slope.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0023] Example Reference Figures 1-3 This embodiment provides a split optical lens, including a substrate 110, a first lens 130, a second lens 140, and an optical fiber socket 150. The substrate 110 is fixedly mounted on a PCB board 120. The first lens 130 is fixedly mounted on the top of the substrate 110 and is used to collimate or focus a beam. The second lens 140 is detachably connected to the top of the first lens 130 and is used to reflect, focus, or collimate a beam. The optical fiber socket 150 is mounted on the second lens 140 and is used to receive and emit light.

[0024] In this embodiment, when the fiber optic socket 150 needs to be replaced, the second lens 140 can be removed from the first lens 130, thereby removing the fiber optic socket 150 as a whole. When the new fiber optic socket 150 and the second lens 140 are reassembled and mounted on the first lens 130, since the first lens 130 is fixed on the PCB board 120 through the substrate 110 and the installation error of the second lens 140 is low, there is no need to readjust the optical path or replace the optical engine, thus greatly reducing maintenance costs.

[0025] As an optional implementation, the bottom of the second lens 140 is provided with at least two positioning posts 141, and the top of the first lens 130 is provided with a first positioning hole 131 that cooperates with the corresponding positioning post 141.

[0026] In this embodiment, the second lens 140 and the first lens 130 can be positioned and assembled using a positioning post 141 and a first positioning hole 131, thereby ensuring that the beam maintains its original optical path after assembly and achieving collimated optical path coupling between the first lens 130 and the second lens 140. It should be noted that the positioning post 141 and the first positioning hole 131 can be precisely fitted (tolerance ≤ 3μm), ensuring a secure and stable assembly.

[0027] As an optional implementation, a fastener 160 is also included. The fastener 160 is used to fix the first lens 130 and the second lens 140 together, which can improve the connection reliability of the first lens 130 and the second lens 140 after assembly, prevent loosening, and thus improve the overall integrity of the lens structure.

[0028] As an optional implementation, the fastener 160 includes a connecting plate 161, a first elastic plate 162, and two second elastic plates 163. The connecting plate 161 is attached to the top surface of the second lens 140. The first elastic plate 162 is connected to one side end of the connecting plate 161 and is attached to the side end face of the first lens 130 and the second lens 140 away from the fiber optic socket 150. The first elastic plate 162 is also engaged with the side end face of the first lens 130. The two second elastic plates 163 are respectively connected to the front and rear ends of the connecting plate 161 and are attached to the front and rear end faces of the first lens 130 and the second lens 140. The two second elastic plates 163 are also engaged with the front and rear end faces of the first lens 130.

[0029] In this embodiment, after the second lens 140 is assembled onto the first lens 130, when the fixing member 160 needs to be installed, the connecting plate 161 is first attached to the top surface of the second lens 140, and then the first elastic plate 162 is snapped onto the side end face of the first lens 130 to simultaneously attach the side end faces of the first lens 130 and the second lens 140 away from the fiber optic socket 150. The two second elastic plates 163 are snapped onto the front and rear end faces of the first lens 130 to simultaneously attach the front and rear end faces of the first lens 130 and the second lens 140, making the first lens 130 and the second lens 140 more secure as a whole. When disassembly is required, the elastic first elastic plate 162 and the second elastic plate 163 are pried open to release the snapping structure, thereby allowing the fixing member 160 to be removed as a whole. The operation is convenient and quick.

[0030] As an optional implementation, the fastener 160 also includes a bending portion 164, through which the first elastic plate 162 and the connecting plate 161, and the second elastic plate 163 and the connecting plate 161 are connected.

[0031] In this embodiment, since the first elastic plate 162 and the second elastic plate 163 need to be moved, the bending structure at the connection is strengthened by the bending portion 164 to improve fatigue resistance, reduce the risk of sudden breakage, and improve the service life of the fastener 160.

[0032] As an optional implementation, the first lens 130 has a locking block 132 on its side end face, the first elastic plate 162 has a locking groove that cooperates with the locking block 132, the front and rear end faces of the first lens 130 are provided with locking posts 133, and the second elastic plate 163 has a locking hole that cooperates with the locking posts 133.

[0033] In this embodiment, when fixation is required, the slot near the bottom of the first elastic plate 162 is aligned with the locking block 132 on the side end face of the first lens 130 and pressed in to form a snap-fit ​​structure. Similarly, the engaging hole of the second elastic plate 163 is aligned with the locking post 133 and pressed in for locking. The fixing operation is convenient and quick. When disassembling, the first elastic plate 162 and the second elastic plate 163 are simply pushed outward to bend them, thereby releasing the corresponding locking block 132 and locking post 133, thus achieving quick disassembly.

[0034] In existing technologies, optical module lenses typically use an optical lens body matched with a fiber optic socket 150. The optical lens body has a collimating lens array, a reflecting surface, and a focusing lens array, while the fiber optic socket 150 is a fiber optic array 151. The transmitting unit emits light from a laser, which is collimated by the collimating lens array on the optical lens body, reflected by the reflecting surface, and focused onto the fiber optic array by the focusing lens array. The receiving unit emits light from the fiber optic array, which is collimated by the collimating lens array on the optical lens body, reflected by the reflecting surface, and focused onto the photodetector by the focusing lens array. When the fiber optic socket 150 is connected to the optical lens body, the Tx end (transmitter) fiber receives the light focused by the optical lens body, and the Rx end (receiver) outputs light to the collimating lens array. However, due to the positional tolerance of the fiber optic array 151 of the fiber optic socket 150 and the positional tolerance of the optical lens array itself, when the axial positional deviation between the fiber optic socket 150 and the optical lens body is >8um, the coupling efficiency will decrease by about 10%, which will also affect the ring light flux at the Tx end, thereby affecting the performance of the optical module and increasing the bit error rate of the optical module. In high-speed optical modules, this can lead to abnormal operation of long fibers.

[0035] Therefore, as an optional implementation, the second lens 140 is provided with a slot 142 that mates with the fiber optic socket 150. A plurality of positioning pins 143 are provided inside the slot 142. The fiber optic socket 150 is provided with a second positioning hole 152 that mates with the positioning pins 143 on one side. The fiber optic socket 150 is connected to the slot 142 of the second lens 140 by an adhesive.

[0036] In this embodiment, the second lens 140 and the fiber optic socket 150 are connected by a positioning pin 143 and a second positioning hole 152. The positioning pin 143 and the second positioning hole 152 are matched with high precision with a fitting gap of <±1µm, resulting in low assembly error. The second lens 140 and the fiber optic socket 150 are fixed with adhesive to make them a whole, thereby improving the positional accuracy.

[0037] Currently, optical lenses typically combine a lens array, a reflective surface, and a fiber optic socket into one optical lens, and another set of optical lenses into a single optical lens, achieving collimated beam docking between the two lenses. However, since one set of lenses includes the lens surface, reflective surface, and fiber optic cable, with numerous fiber optic surfaces, the lens surface needs to be integrated onto the reflective surface, increasing the complexity of the surface design. Furthermore, large-angle incidence makes it difficult to optimize the surface design to the maximum extent, failing to meet the requirements of minimizing the focused beam size in high-speed optical modules and unsuitable for applications requiring small photosensitive surfaces (PDs) in high-speed optical modules. Therefore, placing the optical lens array on an inclined reflective surface further complicates the process, as the inclined surface simultaneously performs reflection and focusing functions, hindering beam size optimization and resulting in poor performance for high-speed optical modules. Additionally, the fiber optic cable within the optical lens requires optical matching adhesive to fill the optical surface and fiber end face, demanding high-precision manufacturing processes and posing a risk of air bubbles that could affect reliability.

[0038] Therefore, as an optional implementation, a laser 170 and a photodetector 180 are provided on the PCB board 120. The laser 170 is used to emit a light beam. A plurality of first optical lens arrays 134 located directly above the laser 170 and the photodetector 180 are provided at the bottom of the first lens 130. The first optical lens arrays 134 are used to collimate or focus the light beam. A reflecting surface 144 for reflecting the light beam is provided on the second lens 140. A second optical lens array 145 is provided at one end of the second lens 140 connected to the fiber optic socket 150. The second optical lens array 145 is used to focus or collimate the light beam reflected by the reflecting surface 144 or the light beam emitted from the fiber optic socket 150.

[0039] In this embodiment, the light emitted by the laser 170 is collimated by the first optical lens array 134 of the first lens 130, then reflected by the reflecting surface 144 of the second lens 140, and then focused by the second optical lens array 145 of the second lens 140 onto the optical fiber array 151 on the optical fiber socket 150 for reception. The light emitted from the optical fiber array 151 on the optical fiber socket 150 is collimated by the second optical lens array 145 of the second lens 140, then reflected by the reflecting surface 144 of the second lens 140, and finally focused by the first optical lens array 134 of the first lens 130 onto the photodetector 180 for reception. Since the reflecting surface 144 of the second lens 140 and the second optical lens array 145 are not on the same plane, it is beneficial to optimize the light spot. Therefore, in this embodiment, by using the first lens 130 and the second lens 140 as collimating optical paths for docking and coupling, a high coupling tolerance optical lens can be formed. Since the collimated light spot is about 200um, which is much larger than the focused light spot of 18um, the coupling tolerance during docking can be effectively improved. Its axial tolerance is >±25um and its radial tolerance is >±200um.

[0040] As an optional implementation, both the first lens 130 and the second lens 140 have anti-reflective inclined surfaces 190 on their surfaces that are in contact with each other. The two anti-reflective inclined surfaces 190 are arranged symmetrically to each other, and the light path formed by the light beam in the first lens 130 and the second lens 140 passes through the anti-reflective inclined surfaces 190.

[0041] In this embodiment, the light beam passes through two anti-reflection slopes 190 during both emission and return in the optical path, which can effectively avoid the influence of direct plane reflection on the optical path.

[0042] As an optional implementation, the anti-reflective slope 190 has an angle greater than 6°, resulting in good anti-reflective effect. The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A split-type optical lens, characterized in that, include: A substrate, which is used to be fixedly mounted on a PCB board; A first lens is fixedly disposed on the top of the substrate and is used to collimate or focus the beam. The second lens is detachably connected to the top of the first lens and is used to reflect the beam and focus or collimate the beam. An optical fiber socket is disposed on the second lens and is used to receive and emit light beams.

2. A split-type optical lens as described in claim 1, characterized in that, The second lens has at least two positioning posts at its bottom, and the first lens has a first positioning hole at its top that mates with the corresponding positioning posts.

3. A split optical lens as described in claim 2, characterized in that, It also includes a fastener for securing the first lens and the second lens together.

4. A split optical lens as described in claim 3, characterized in that, The fastener includes: A connecting plate, wherein the connecting plate is attached to the top surface of the second lens; A first elastic plate is connected to one side of the connecting plate. The first elastic plate is simultaneously attached to the side end face of the first lens and the second lens away from the fiber optic socket, and the first elastic plate is snapped into the side end face of the first lens. Two second elastic plates are respectively connected to the front and rear ends of the connecting plate. The two second elastic plates are simultaneously attached to the front and rear end faces of the first lens and the second lens, and the two second elastic plates are respectively engaged with the front and rear end faces of the first lens.

5. A split optical lens as described in claim 4, characterized in that, The fastener also includes a bending portion, through which the first elastic plate and the connecting plate, and the second elastic plate and the connecting plate are connected.

6. A split optical lens as described in claim 4, characterized in that, The first lens has a locking block on its side end face, and the first elastic plate has a locking groove that mates with the locking block. The front and rear ends of the first lens are provided with locking posts, and the second elastic plate has locking holes that mate with the locking posts.

7. A split optical lens as described in claim 1, characterized in that, The second lens has a slot that mates with the fiber optic socket. The slot has several positioning pins inside. The fiber optic socket has a second positioning hole on one side that mates with the positioning pins. The fiber optic socket is connected to the slot of the second lens by an adhesive.

8. A split optical lens as described in any one of claims 1-7, characterized in that, A laser and a photodetector are mounted on the PCB board. The laser is used to emit a light beam. A plurality of first optical lens arrays are mounted on the bottom of the first lens and located directly above the laser and the photodetector. The first optical lens arrays are used to collimate or focus the light beam. A reflective surface is mounted on the second lens to reflect the light beam. A second optical lens array is mounted on one end of the second lens that connects to the optical fiber socket. The second optical lens array is used to focus or collimate the light beam reflected by the reflective surface to the light beam emitted from the optical fiber socket.

9. A split optical lens as described in claim 8, characterized in that, The first lens and the second lens each have an anti-reflective slope on their mating surfaces. The two anti-reflective slopes are arranged symmetrically to each other, and the light path formed by the light beam in the first lens and the second lens both passes through the anti-reflective slopes.

10. A split optical lens as described in claim 9, characterized in that, The slope of the anti-reflective slope is greater than 6°.

Images